[misc] set initial microphone volume

bin/sc

@@ -17,6 +17,8 @@ function _start -a x y w h fps
         exit 1
     end
     set outfile "$HOME/recording/screencast-"(date '+%y%m%d-%H%M-%S')".mp4"
+    touch /tmp/recording.pid
+    sleep 1
     ffmpeg \
         -f x11grab -s $w'x'$h -i "$DISPLAY+$x,$y" \
         -f alsa -i default \
@@ -115,6 +117,8 @@ function desktop -a fps
         echo 'unable to find geometry of the first monitor'
         exit 1
     end
+    #micvol 15000
+    pacmd set-source-volume noechosource 52000
     _start $m[4] $m[5] $m[2] $m[3] $fps
 end
 
@@ -150,6 +154,26 @@ function cover -a infile text gravity outfile
         $outfile
 end
 
+set --append subcmds keep_mic_vol
+function keep_mic_vol -a volume
+    while true
+        pacmd set-source-volume noechosource $volume
+        sleep 0.1
+    end
+end
+
+set --append subcmds micvol
+set micvol_help '<volume>' '0~65535'
+function micvol -a volume
+    set kmvpid (ps aux | grep ' keep_mic_vol ' | head -n -1 | awk '{print $2}')
+    if test -n "$kmvpid"
+        echo killing $kmvpid
+        kill $kmvpid
+    end
+    set sc (status filename)
+    $sc keep_mic_vol $volume &
+end
+
 set --append subcmds help
 set help_help '[subcmd]' 'print this menu'
 function help -a subcmd